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200℃回火对X80管线钢在NaHCO3溶液中电化学腐蚀的影响

Xia Wang,Yuwei Sun,Minquan Luo

Corrosion & Protection（2013）

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Abstract
采用热处理炉对X80管线钢进行200℃回火30 min,通过动电位极化,电化学阻抗谱等技术研究了回火前后X80钢在NaHCO3溶液中的腐蚀电化学行为.结果表明,回火前后X80在NaHCO3溶液中的腐蚀都是阴极控制腐蚀类型,但低温回火后X80钢的自腐蚀电位从回火前的-0.739V降低为-0.877 V(SCE),并且维钝电流也从回火前的5.48μA·cm-2升高到17.82μA·cm-2；电化学阻抗谱测试表明,低温回火后的钝化膜比回火前X80钢钝化膜疏松,这与金相显微镜观察结果相吻合.
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Key words
polarization curve,EIS,low-temperature tempering,electrochemical behavior
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